42750039 has 4 divisors (see below), whose sum is σ = 57000056. Its totient is φ = 28500024.

The previous prime is 42750017. The next prime is 42750049. The reversal of 42750039 is 93005724.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 42750039 - 2¹² = 42745943 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42749988 and 42750015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42750049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7125004 + ... + 7125009.

It is an arithmetic number, because the mean of its divisors is an integer number (14250014).

Almost surely, 2^42750039 is an apocalyptic number.

42750039 is a deficient number, since it is larger than the sum of its proper divisors (14250017).

42750039 is a wasteful number, since it uses less digits than its factorization.

42750039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14250016.

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 42750039 is about 6538.3513977149. The cubic root of 42750039 is about 349.6596391882.

The spelling of 42750039 in words is "forty-two million, seven hundred fifty thousand, thirty-nine".